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San Tan Valley, AZ Weather. The average temperature of San Tan Valley is 71.43Â°F, which is much higher than the Arizona average temperature of 65.97Â°F and is much higher than the national average temperature of 54.45Â°F. Historical Weather. Heating Cost Index, #76.
When the temperature dropped to a relatively cool 107 degrees on July 12, 2012, Death Valley tied the desert nation of Oman, on the Arabian Peninsula, for the hottest low temperature ever recorded. And in June of this year, Death Valley came within 5 degrees of the 1913 record when saw temperatures reach 129 degrees.